Automatic merge from submit-queue

Productionize the cockroachdb example a little more

Includes:
* A service for clients to use
* Readiness/liveness probes
* An extended graceful termination period
* Automatic prometheus monitoring (when prometheus is configured to watch for annotations on services, as in [CoreOS's recent blog post](https://coreos.com/blog/prometheus-and-kubernetes-up-and-running.html), for example)

I'm leaving the management of certs to future work, but if anyone that sees this needs help with them in the meantime, don't hesitate to reach out.

Successor to #28446

@bprashanth - if you're still interested in / open to an e2e test (as mentioned in https://github.com/cockroachdb/cockroach/issues/5967#issuecomment-230188807), let me know and I'll put one together. If so, I assume you'd want it as part of the `petset` test group rather than the `examples` tests?

cc @tschottdorf 

**Release note**:
```release-note
NONE
```